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                            <b>0.1.</b>
                        
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                            <b>0.2.</b>
                        
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                            <b>0.3.</b>
                        
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                        JSON 解析
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                        JSON 解析第三方框架
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                        PList解析
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                        XML介绍
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                        准备工作
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                        绑定表格
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                        Copy 属性
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                        重构
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                        DOM 解析
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                        GET &amp; POST
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                        GET 缓存
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                        用户登录
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                        GET &amp; POST 登录
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                        保存 &amp; 加载用户信息
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                        代码重构
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                            <b>0.6.</b>
                        
                        密码学
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                            <b>0.6.1.</b>
                        
                        Base64
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                            <b>0.6.2.</b>
                        
                        MD5
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                            <b>0.6.3.</b>
                        
                        钥匙串
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                            <b>0.6.4.</b>
                        
                        对称加密算法
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                        非对称加密算法
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                        POST增强
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                        上传单个文件
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                        上传多个文件
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                        RESTful设计风格
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                            <b>0.7.4.</b>
                        
                        POST JSON
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                        POST 自定义对象
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                            <b>0.8.</b>
                        
                        NSURLConnection下载
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                            <b>0.8.1.</b>
                        
                        HTTP HEAD方法
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                            <b>0.8.2.</b>
                        
                        NSURLConnectionDownloadDelegate
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                            <b>0.8.3.</b>
                        
                        下载进度
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                            <b>0.8.4.</b>
                        
                        NSFileHandle拼接文件
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                            <b>0.8.5.</b>
                        
                        NSOutputStream拼接文件
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                            <b>0.8.6.</b>
                        
                        断点续传
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                            <b>0.8.7.</b>
                        
                        多线程
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                            <b>0.8.8.</b>
                        
                        完成回调
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                            <b>0.8.9.</b>
                        
                        暂停下载
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                            <b>0.8.10.</b>
                        
                        下载进度视图
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                            <b>0.8.11.</b>
                        
                        下载管理器
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                            <b>0.8.12.</b>
                        
                        NSOperation
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                            <b>0.9.</b>
                        
                        NSURLSession
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                            <b>0.9.1.</b>
                        
                        常见代码
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                            <b>0.9.2.</b>
                        
                        下载 &amp; 解压缩
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                            <b>0.9.2.1.</b>
                        
                        下载进度跟进
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                            <b>0.9.2.2.</b>
                        
                        断点续传
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                            <b>0.9.2.3.</b>
                        
                        下载管理器
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                            <b>0.9.3.</b>
                        
                        WebDav演练
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                            <b>0.9.4.</b>
                        
                        Configuration
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                            <b>0.9.5.</b>
                        
                        POST 上传
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                            <b>0.10.</b>
                        
                        HTTPS
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                            <b>0.11.</b>
                        
                        指纹识别
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                            <b>0.12.</b>
                        
                        附录
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                        归档 &amp; 解档
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                        核心动画
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                        KVO
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                        nil&amp;null&amp;Nil&amp;NSNull
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                            <b>0.12.5.</b>
                        
                        常用 HTTP 请求字段
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                            <b>0.12.6.</b>
                        
                        Cocoapods
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                        <h1 id="nsurlconnection">NSURLConnection</h1>
<h2 id="%E6%AD%A5%E9%AA%A4">&#x6B65;&#x9AA4;</h2>
<ol>
<li><code>NSURL</code>&#xFF1A;&#x786E;&#x5B9A;&#x8981;&#x8BBF;&#x95EE;&#x7684;&#x8D44;&#x6E90;</li>
<li><code>NSURLRequest</code>&#xFF1A;&#x6839;&#x636E; <code>URL</code> &#x5EFA;&#x7ACB;&#x8BF7;&#x6C42;&#xFF0C;&#x5411;&#x670D;&#x52A1;&#x5668;&#x7D22;&#x8981;&#x6570;&#x636E;</li>
<li><code>NSURLConnection</code>&#xFF1A;&#x5EFA;&#x7ACB;&#x7F51;&#x7EDC;&#x8FDE;&#x63A5;&#xFF0C;&#x5C06;&#x8BF7;&#x6C42;(&#x5F02;&#x6B65;)&#x53D1;&#x9001;&#x7ED9;&#x670D;&#x52A1;&#x5668;</li>
</ol>
<h3 id="%E7%A4%BA%E4%BE%8B%E4%BB%A3%E7%A0%81">&#x793A;&#x4F8B;&#x4EE3;&#x7801;</h3>
<pre><code class="lang-objc"><span class="hljs-comment">// 1. `NSURL`&#xFF1A;&#x786E;&#x5B9A;&#x8981;&#x8BBF;&#x95EE;&#x7684;&#x8D44;&#x6E90;</span>
<span class="hljs-built_in">NSURL</span> *url = [<span class="hljs-built_in">NSURL</span> URLWithString:<span class="hljs-string">@&quot;http://m.baidu.com&quot;</span>];

<span class="hljs-comment">// 2. `NSURLRequest`&#xFF1A;&#x6839;&#x636E; `URL` &#x5EFA;&#x7ACB;&#x8BF7;&#x6C42;&#xFF0C;&#x5411;&#x670D;&#x52A1;&#x5668;&#x7D22;&#x8981;&#x6570;&#x636E;</span>
<span class="hljs-built_in">NSURLRequest</span> *request = [<span class="hljs-built_in">NSURLRequest</span> requestWithURL:url];

<span class="hljs-comment">// 3. `NSURLConnection`&#xFF1A;&#x5EFA;&#x7ACB;&#x7F51;&#x7EDC;&#x8FDE;&#x63A5;&#xFF0C;&#x5C06;&#x8BF7;&#x6C42;(&#x5F02;&#x6B65;)&#x53D1;&#x9001;&#x7ED9;&#x670D;&#x52A1;&#x5668;</span>
[<span class="hljs-built_in">NSURLConnection</span> sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, <span class="hljs-built_in">NSData</span> *data, <span class="hljs-built_in">NSError</span> *connectionError) {

    <span class="hljs-built_in">NSLog</span>(<span class="hljs-string">@&quot;%@&quot;</span>, data);
}];
</code></pre>
<h3 id="-nsurlconnection-%E4%BB%A3%E7%A0%81%E5%B0%8F%E7%BB%93"><code>NSURLConnection</code> &#x4EE3;&#x7801;&#x5C0F;&#x7ED3;</h3>
<h4 id="-sendasynchronousrequest-%E5%8F%91%E9%80%81%E5%BC%82%E6%AD%A5%E8%AF%B7%E6%B1%82"><code>sendAsynchronousRequest</code> &#x53D1;&#x9001;&#x5F02;&#x6B65;&#x8BF7;&#x6C42;</h4>
<ul>
<li>&#x6B64;&#x65B9;&#x6CD5;&#x5C31;&#x662F;&#x5F02;&#x6B65;&#x6267;&#x884C;&#x7684;&#xFF0C;&#x7A0B;&#x5E8F;&#x5458;&#x65E0;&#x5E8F;&#x8003;&#x8651;&#x5F00;&#x542F;&#x7EBF;&#x7A0B;&#xFF0C;&#x6216;&#x8005;&#x521B;&#x5EFA;&#x961F;&#x5217;</li>
<li>&#x4F1A;&#x5C06;&#x4E4B;&#x524D;&#x5EFA;&#x7ACB;&#x597D;&#x7684;&#x8BF7;&#x6C42;<code>&#x5F02;&#x6B65;</code>&#x53D1;&#x9001;&#x7ED9;&#x670D;&#x52A1;&#x5668;</li>
<li>&#x7B49;&#x5230;&#x63A5;&#x6536;&#x5230;&#x670D;&#x52A1;&#x5668;&#x54CD;&#x5E94;&#x540E;&#xFF0C;&#x7531; <code>queue</code> &#x8D1F;&#x8D23;&#x8C03;&#x5EA6; <code>completionHandler</code> &#x7684;&#x6267;&#x884C;</li>
</ul>
<h4 id="%E9%98%9F%E5%88%97">&#x961F;&#x5217;</h4>
<ul>
<li>&#x8C03;&#x5EA6; <code>completionHandler</code> &#x6267;&#x884C;&#x7684;&#x961F;&#x5217;<ul>
<li><code>[[NSOperationQueue alloc] init]</code>&#xFF0C;&#x540E;&#x53F0;&#x7EBF;&#x7A0B;&#x5F02;&#x6B65;&#x6267;&#x884C;</li>
<li><code>[NSOperationQueue mainQueue]</code>&#xFF0C;&#x4E3B;&#x7EBF;&#x7A0B;&#x5F02;&#x6B65;&#x6267;&#x884C;</li>
</ul>
</li>
<li>&#x961F;&#x5217;&#x7684;&#x9009;&#x62E9;<ul>
<li>&#x5982;&#x679C;&#x8981;&#x5BF9;&#x6570;&#x636E;&#x8FDB;&#x884C;&#x8017;&#x65F6;&#x5904;&#x7406;&#xFF0C;&#x4F8B;&#x5982;&#xFF1A;&#x89E3;&#x538B;&#x7F29;&#x7B49;&#xFF0C;&#x9009;&#x62E9;&#x65B0;&#x5EFA;&#x961F;&#x5217;&#x8C03;&#x5EA6;</li>
<li>&#x5982;&#x679C;&#x53EA;&#x662F;&#x505A;&#x7B80;&#x5355;&#x5904;&#x7406;&#xFF0C;&#x7ACB;&#x5373;&#x66F4;&#x65B0; UI&#xFF0C;&#x9009;&#x62E9;&#x4E3B;&#x961F;&#x5217;</li>
</ul>
</li>
</ul>
<h4 id="completionhandler">completionHandler</h4>
<ul>
<li>&#x7F51;&#x7EDC;&#x8BBF;&#x95EE;&#x5DF2;&#x7ECF;&#x7ED3;&#x675F;&#xFF0C;&#x63A5;&#x6536;&#x5230;&#x670D;&#x52A1;&#x5668;&#x54CD;&#x5E94;&#x6570;&#x636E;&#x540E;&#x7684;&#x56DE;&#x8C03;&#x65B9;&#x6CD5;</li>
<li><code>response</code>&#xFF0C;&#x670D;&#x52A1;&#x5668;&#x7684;&#x54CD;&#x5E94;&#xFF0C;&#x901A;&#x5E38;&#x5728;&#x5F00;&#x53D1;<code>&#x4E0B;&#x8F7D;</code>&#x529F;&#x80FD;&#x65F6;&#x624D;&#x4F1A;&#x4F7F;&#x7528;</li>
</ul>
<table>
<thead>
<tr>
<th>&#x54CD;&#x5E94;&#x5C5E;&#x6027;</th>
<th>&#x8BF4;&#x660E;</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>URL</code></td>
<td>&#x670D;&#x52A1;&#x5668;&#x53CD;&#x9988;&#x7684; URL&#xFF0C;&#x6709;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x670D;&#x52A1;&#x5668;&#x4F1A;&#x91CD;&#x5B9A;&#x5411;&#x65B0;&#x7684; URL</td>
</tr>
<tr>
<td><code>MIMEType</code></td>
<td><ul><li>&#x670D;&#x52A1;&#x5668;&#x544A;&#x8BC9;&#x5BA2;&#x6237;&#x7AEF;&#xFF0C;&#x8FD4;&#x56DE;&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x636E;&#x7684;&#x7C7B;&#x578B;</li><li><code>ContentType</code></li><li>&#x6839;&#x636E; MIMEType &#x5BA2;&#x6237;&#x7AEF;&#x5C31;&#x77E5;&#x9053;&#x4F7F;&#x7528;&#x4EC0;&#x4E48;&#x8F6F;&#x4EF6;&#x5904;&#x7406;&#x8FD4;&#x56DE;&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x636E;</li><li>&#x7F51;&#x7EDC;&#x4E4B;&#x6240;&#x4EE5;&#x8FD9;&#x4E48;&#x4E30;&#x5BCC;&#x591A;&#x5F69;&#xFF0C;&#x662F;&#x56E0;&#x4E3A;&#x6709;&#x975E;&#x5E38;&#x591A;&#x7684;&#x5BA2;&#x6237;&#x7AEF;&#x8F6F;&#x4EF6;</li></ul></td>
</tr>
<tr>
<td><code>statusCode</code></td>
<td>&#x72B6;&#x6001;&#x7801;<br><ul><li>1XX&#x6D88;&#x606F;</li><li>2XX &#x6210;&#x529F;</li><li>3XX &#x66F4;&#x591A;&#x9009;&#x62E9;</li><li>4XX &#x5BA2;&#x6237;&#x7AEF;&#x9519;&#x8BEF;</li><li>5XX &#x670D;&#x52A1;&#x5668;&#x9519;&#x8BEF;</li></ul></td>
</tr>
<tr>
<td><code>expectedContentLength</code></td>
<td>&#x6570;&#x636E;&#x957F;&#x5EA6;&#xFF0C;&#x4E0B;&#x8F7D;&#x6587;&#x4EF6;&#x603B;&#x957F;&#x5EA6;</td>
</tr>
<tr>
<td><code>suggestedFilename</code></td>
<td>&#x5EFA;&#x8BAE;&#x7684;&#x6587;&#x4EF6;&#x540D;</td>
</tr>
</tbody>
</table>
<ul>
<li><code>data</code> &#x670D;&#x52A1;&#x5668;&#x8FD4;&#x56DE;&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x636E;&#xFF0C;&#x7A0B;&#x5E8F;&#x5458;&#x6700;&#x5173;&#x5FC3;&#x7684;&#x5185;&#x5BB9;</li>
<li><code>connectionError</code> &#x8FDE;&#x63A5;&#x9519;&#x8BEF;&#xFF0C;&#x4EFB;&#x4F55;&#x7F51;&#x7EDC;&#x8BBF;&#x95EE;&#x90FD;&#x6709;&#x53EF;&#x80FD;&#x51FA;&#x73B0;&#x9519;&#x8BEF;</li>
</ul>
<pre><code class="lang-objc"><span class="hljs-comment">// &#x6807;&#x51C6;&#x7684;&#x9519;&#x8BEF;&#x5904;&#x7406;&#x65B9;&#x6CD5;</span>
<span class="hljs-keyword">if</span> (connectionError || data == <span class="hljs-literal">nil</span>) {
    <span class="hljs-built_in">NSLog</span>(<span class="hljs-string">@&quot;&#x7F51;&#x7EDC;&#x4E0D;&#x7ED9;&#x529B;&#xFF01;&quot;</span>);
    <span class="hljs-keyword">return</span>;
}
</code></pre>
<h3 id="%E8%AF%B7%E6%B1%82">&#x8BF7;&#x6C42;</h3>
<ol>
<li>&#x57FA;&#x4E8E; <code>URL</code> &#x5EFA;&#x7ACB;&#x8BF7;&#x6C42;</li>
<li>&#x8BBE;&#x7F6E;&#x8BF7;&#x6C42;&#x5C5E;&#x6027;&#xFF1A;<code>&#x7F13;&#x5B58;&#x7B56;&#x7565;</code>&#xFF0C;<code>&#x7F51;&#x7EDC;&#x8D85;&#x65F6;&#x65F6;&#x957F;</code></li>
<li>&#x544A;&#x8BC9;&#x670D;&#x52A1;&#x5668;&#x989D;&#x5916;&#x4FE1;&#x606F;&#xFF1A;<code>&#x5BA2;&#x6237;&#x7AEF;&#x7C7B;&#x578B;</code>&#xFF0C;<code>&#x8EAB;&#x4EFD;&#x9A8C;&#x8BC1;</code>...</li>
</ol>
<pre><code class="lang-objc"><span class="hljs-comment">// &#x544A;&#x8BC9;&#x670D;&#x52A1;&#x5668;&#xFF0C;&#x5BA2;&#x6237;&#x7AEF;&#x7684;&#x7C7B;&#x578B;&#x662F; iPhone&#xFF0C;&#x800C;&#x4E14;&#x652F;&#x6301; AppleWebKit</span>
[request setValue:<span class="hljs-string">@&quot;iPhone AppleWebKit&quot;</span> forHTTPHeaderField:<span class="hljs-string">@&quot;User-Agent&quot;</span>];
</code></pre>
<h4 id="%E7%BC%93%E5%AD%98%E7%AD%96%E7%95%A5">&#x7F13;&#x5B58;&#x7B56;&#x7565;</h4>
<table>
<thead>
<tr>
<th>&#x679A;&#x4E3E;</th>
<th>&#x6570;&#x503C;</th>
<th>&#x8BF4;&#x660E;</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>NSURLRequestUseProtocolCachePolicy</code></td>
<td>0</td>
<td>&#x9ED8;&#x8BA4;&#x7684;&#x7F13;&#x5B58;&#x7B56;&#x7565;</td>
</tr>
<tr>
<td><code>NSURLRequestReloadIgnoringLocalCacheData</code></td>
<td>1</td>
<td><ul><li>&#x5FFD;&#x7565;&#x672C;&#x5730;&#x7F13;&#x5B58;&#x6570;&#x636E;&#xFF0C;&#x59CB;&#x7EC8;&#x52A0;&#x8F7D;&#x670D;&#x52A1;&#x5668;&#x7684;&#x6570;&#x636E;</li><li>&#x5BF9;&#x6570;&#x636E;&#x7684;&#x53CA;&#x65F6;&#x6027;&#x8981;&#x6C42;&#x9AD8;&#x7684;&#x5E94;&#x7528;</li><li>&#x4F8B;&#x5982;&#xFF1A;&#x5F69;&#x7968;&#x3001;&#x80A1;&#x7968;&#x7B49;</li></ul></td>
</tr>
<tr>
<td><code>NSURLRequestReturnCacheDataElseLoad</code></td>
<td>2</td>
<td>&#x5982;&#x679C;&#x6709;&#x7F13;&#x5B58;&#xFF0C;&#x5C31;&#x8FD4;&#x56DE;&#x7F13;&#x5B58;&#xFF0C;&#x5426;&#x5219;&#x52A0;&#x8F7D;&#x6570;&#x636E;</td>
</tr>
<tr>
<td><code>NSURLRequestReturnCacheDataDontLoad</code></td>
<td>3</td>
<td>&#x5982;&#x679C;&#x6709;&#x7F13;&#x5B58;&#xFF0C;&#x5C31;&#x8FD4;&#x56DE;&#x7F13;&#x5B58;&#xFF0C;&#x5426;&#x5219;&#x4E0D;&#x52A0;&#x8F7D;</td>
</tr>
</tbody>
</table>
<h4 id="%E8%B6%85%E6%97%B6%E6%97%B6%E9%95%BF">&#x8D85;&#x65F6;&#x65F6;&#x957F;</h4>
<ul>
<li>&#x9ED8;&#x8BA4;&#x7F51;&#x7EDC;&#x65F6;&#x957F;&#x662F; <code>60 s</code></li>
<li>&#x5EFA;&#x8BAE;&#x8D85;&#x65F6;&#x65F6;&#x957F; <code>15~30</code> &#x79D2;&#x4E4B;&#x95F4;</li>
<li>&#x6CE8;&#x610F;&#x8D85;&#x65F6;&#x65F6;&#x957F;&#x4E0D;&#x80FD;&#x592A;&#x77ED;</li>
<li><code>SDWebImage</code> &#x7684;&#x9ED8;&#x8BA4;&#x8D85;&#x65F6;&#x65F6;&#x957F;&#x662F; <code>15</code> &#x79D2;</li>
<li><code>AFN</code> &#x7684;&#x9ED8;&#x8BA4;&#x8D85;&#x65F6;&#x65F6;&#x957F;&#x662F; <code>60</code> &#x79D2;</li>
</ul>

                    
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